From what I checked, I noticed you have added the custom CSS for this from this file JoomlaFolder/media/template/theme-000335d3.css, you can check my attached screenshot below.

Perhaps you can try to remove this custom styling then temporarily disable the JCH optimize plugin and clear your backend cache, check again whether it shows the correct styling?

If yes, then reactivate back your JCH optimize plugin and your cache setting.

Hello
What you are pointing with your screenshot is the solution that i applied with some custom css because the inherit value that is in the default css is not working.
Before i report something in the forum i always follow the steps that you mentioned with jch and cache.
Either way i found a solution for my self and i mentioned it as a bug in case you want to investigate it.
Kind regards

I see, I already reported this to our designer, we will fix this in the next release version.

Hmm sorry, I've replied too fast, our designer just updated me, it seems like the Easyblog styling (<h4 class="eb-section-heading reset-heading">) doesn't use the Easyblog font family styling, it should use the template styling, this is why our styling put this font-family: inherit;

So it will inherit the template initially font family styling which is "Roboto Slab", you can check my attached screenshot below.

In other words, without your custom CSS code, now the header styling already inherit from your template initially font family styling which is "Roboto Slab".

I think you have to investigate that is there any setting from your template that can set this font family to "Roboto Slab"? Because this is nothing we can do if the template initially font-family already set to "Roboto Slab".

This is the part you need to figure it out then you do not need to put your custom CSS code on the site.

Sorry for my late reply but seems that I'm no longer receiving email notifications for new answer in the forum.
I will investigate further the issue and i will inform you.
Thank you very much

No problem, can you check your spam folder from your mailbox and see whether the email notification went to this folder?

I will investigate further the issue and i will inform you.

Sure, keep us update then.